Re: [PATCH v6 0/5] Initial support for multi-actuator HDDs

Damien Le Moal [off-list ref] writes:

Single LUN multi-actuator hard-disks are cappable to seek and execute
multiple commands in parallel. This capability is exposed to the host
using the Concurrent Positioning Ranges VPD page (SCSI) and Log (ATA).
Each positioning range describes the contiguous set of LBAs that an
actuator serves.

Are these ranges exlusive to each actuator or can they overlap?

This series does not attempt in any way to optimize accesses to
multi-actuator devices (e.g. block IO schedulers or filesystems). This
initial support only exposes the independent access ranges information
to user space through sysfs.

Is the plan to eventually change the IO scheduler to maintain two
different queues, one for each actuator, and send down commands for two
different IO streams that the elevator attempts to keep sequential?